42721207 has 4 divisors (see below), whose sum is σ = 43136080. Its totient is φ = 42306336.

The previous prime is 42721201. The next prime is 42721213. The reversal of 42721207 is 70212724.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42721201) and next prime (42721213).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42721207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207282 + ... + 207487.

It is an arithmetic number, because the mean of its divisors is an integer number (10784020).

Almost surely, 2^42721207 is an apocalyptic number.

42721207 is a deficient number, since it is larger than the sum of its proper divisors (414873).

42721207 is a wasteful number, since it uses less digits than its factorization.

42721207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414872.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 42721207 is about 6536.1461886956. The cubic root of 42721207 is about 349.5810142777.

The spelling of 42721207 in words is "forty-two million, seven hundred twenty-one thousand, two hundred seven".